The existing ecological revetment focuses mainly on stability and less on ecology.To improve the ecology of the bank slope，we propose a ring interlocking ecological revetment structure.To investigate the stability and protective effect of this structure at the initial construction stage (without vegetation)，we compare the bank slope stability under different protective measures and study the effect of flow velocity on the stability and protective effect of the revetment structure by dynamic bed experiments.The results are as follows.1) The proposed structure can reduce the scour area and depth of the bank slope and enhance the stability of the bank slope.2）There are two instability forms，including slump instability due to slope footing deformation and sag instability due to bank slope hollowing.3) The scour area and maximum scour depth increase with rising flow velocity，and their growth rate decreases with increasing flow velocity.